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[Serge Hallyn <1409425@xxxxxxxxxxxxxxxxxx>]

The fix is in lxc git HEAD.  It should show up in lxc 1.1 soon.

** Changed in: lxc (Ubuntu)
       Status: Confirmed => Fix Committed

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https://bugs.launchpad.net/bugs/1409425

Title:
  lxc-start-ephemeral stops working with kernel 3.18 - overlayfs change?

Status in linux package in Ubuntu:
  Invalid
Status in lxc package in Ubuntu:
  Fix Committed

Bug description:
  With the previous vivid kernel 3.16.0-28-generic,"lxc-start-ephemeral
  -o containername" works fine. With the current 3.18.0-8-generic  it
  fails with "the container failed to start". This is reproducible in a
  clean cloud VM:

  $ sudo apt install lxc
  $ sudo lxc-create -t busybox -n c1

  # works fine under all kernels:
  $ sudo lxc-start -n c1 -F

  $ sudo lxc-start-ephemeral -o c1
  The container 'c1-0twqb553' failed to start.

  It happens with both the above busybox as well as with a full ubuntu
  OS container, so I don't think that's relevant.

  Unfortunately lxc-start-ephemeral has no --logfile or --logpriority or
  similar debugging tools, and even with -k it doesn't keep a container
  or logs around for inspection.

  dmesg might have something worth noting, look at the third line:

  [  465.694541] device vethQLD78J entered promiscuous mode
  [  465.694611] IPv6: ADDRCONF(NETDEV_UP): vethQLD78J: link is not ready
  [  465.726758] overlayfs: missing upperdir or lowerdir or workdir
  [  465.744501] eth0: renamed from vethWRSY7B
  [  465.745673] IPv6: ADDRCONF(NETDEV_CHANGE): vethQLD78J: link becomes ready
  [  465.745693] lxcbr0: port 1(vethQLD78J) entered forwarding state
  [  465.745697] lxcbr0: port 1(vethQLD78J) entered forwarding state
  [  465.746618] lxcbr0: port 1(vethQLD78J) entered disabled state
  [  465.747134] device vethQLD78J left promiscuous mode
  [  465.747140] lxcbr0: port 1(vethQLD78J) entered disabled state

  So maybe overlayfs changed its semantics somehow in the new kernel?

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: lxc 1.1.0~alpha3-0ubuntu1
  ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
  Uname: Linux 3.16.0-28-generic x86_64
  ApportVersion: 2.15.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sun Jan 11 12:45:06 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-11-20 (52 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20141119)
  SourcePackage: lxc
  UpgradeStatus: No upgrade log present (probably fresh install)
  defaults.conf:
   lxc.network.type = veth
   lxc.network.link = lxcbr0
   lxc.network.flags = up
   lxc.network.hwaddr = 00:16:3e:xx:xx:xx
  lxc.conf: lxc.lxcpath = /srv/lxc
  modified.conffile..etc.apparmor.d.abstractions.lxc.start.container: [modified]
  mtime.conffile..etc.apparmor.d.abstractions.lxc.start.container: 2015-01-08T13:09:02.545927

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